Select the best answer choice.

Regarding the assigned case SouthTrust Bank v$.$ Williams, $775$ So$\mathrm{.}2$d $184(2000)--$

What kind of contract do the plaintiff and defendant have?

Unenforceable, because one party modified the contract without consideration.

Bilateral, because the offeror $($the bank$)$ made an offer or promise of services, and the offeree $($the customers$),$ made a return promise to open a bank account.

Unenforceable, because one party changed the terms of the contract without authorization from the other party.

Unilateral, because the offeror $($the bank$)$ made an offer of services inviting performance, and the offeree $($the customers$)$ accepted that offer with performance.